Hui Ma; Haijun Zhang; Xianfu Wang; Julian Cheng; Backhaul-Aware User Association and Resource Allocation for Massive MIMO Enabled HetNets, IEEE Communications Letters, 2017, 21(12): 2710-2713..

Hui Ma; Julian Cheng; Xianfu Wang; Piming Ma; Robust MISO Beamforming With Cooperative Jamming for Secure Transmission From Perspectives of QoS and Secrecy Rate, IEEE Transactions on Communications, 2018, 66(2): 767-780..

Hui Ma; Julian Cheng; Xianfu Wang; Proportional Fair Secrecy Beamforming for MISO Heterogeneous Cellular Networks With Wireless Information and Power Transfer, IEEE Transactions on Communications, 2019, 67(8): 5659-5673..